预制钢桁架加固钢筋混凝土框架试验

目的验证一种新的框架结构整体抗震加固方法的可行性.方法对已损伤的一榀框架做预制钢桁架加固,并对加固后的试件进行水平低周反复荷载试验,分析其力学性能、变形能力、抗侧力体系的破坏特征,与理论值进行比较判断两个框架的抗震能力.结果加固后试件表现了较强的耗能能力,骨架曲线的平行段较长,其滞回曲线形状饱满,充分体现了预制钢桁架加固钢筋混凝土的优越性.加固后原框架承载力约提高了16%,框架的延性系数是原来的1.2倍,提高了框架结构的变形能力.结论预制钢桁架加固钢筋混凝土的方法可提高试件的承载力、耗能能力以及变形能力.

Study on a Reinforced Concrete Frame Strengthened with Precast Steel Trusses

In order to verify a new seismic strengthening method for frame structure is feasible,we reinforce a framew ork w hich w as damaged and get a low reversed cyclic loading test to the specimen. From the results w e analyze the mechanical property,deformability and failure characteristics of the specimen. The energy dissipation capacity of the specimen after reinforcement is strong,and the skeleton curve’s phase of parallel lines is long. The full hysteretic curves prove the superiority of this w ay of strengthening. The original framew ork bearing capacity increased by 16%,the reinforced frame ductility coefficient is about 1. 2 times of the original. Prefabricated steel truss reinforced concrete method can improve the bearing capacity of the specimens,the capacity and deformation capacity.